tests/test-login_tty.c

   1 /* Test of login_tty() function.
   2    Copyright (C) 2010-2019 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 extern int login_tty (int);
  21
  22 #include <errno.h>
  23 #include <pty.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <termios.h>
  27 #include <unistd.h>
  28
  29 int
  30 main ()
  31 {
  32   int master;
  33   int slave;
  34
  35   /* Open a pseudo-terminal, as a master-slave pair.  */
  36   {
  37     int res = openpty (&master, &slave, NULL, NULL, NULL);
  38     if (res != 0)
  39       {
  40         fprintf (stderr, "openpty returned %d\n", res);
  41         return 1;
  42       }
  43   }
  44
  45   /* Create a new session and make it the controlling tty of this session.  */
  46   {
  47     int res = login_tty (slave);
  48     if (res < 0)
  49       {
  50         fprintf (stderr, "login_tty failed\n");
  51         return 1;
  52       }
  53   }
  54
  55   /* From here on, we cannot use stderr for error messages any more.
  56      If a test fails, just abort.  */
  57
  58   /* Check that fd = 0, 1, 2 are now open to the controlling terminal for the
  59      current process and that it is a session of its own.  */
  60   {
  61     int fd;
  62     for (fd = 0; fd < 3; fd++)
  63       if (!(tcgetpgrp (fd) == getpid ()))
  64         abort ();
  65     for (fd = 0; fd < 3; fd++)
  66       {
  67         int sid = tcgetsid (fd);
  68         if (!(sid == -1 ? errno == ENOSYS : sid == getpid ()))
  69           abort ();
  70       }
  71   }
  72
  73   return 0;
  74 }